/*
 * Copyright (c) 2007, 2015, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */
/*
 * Copyright 2004 The Apache Software Foundation.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.sun.org.apache.xerces.internal.impl.dv.util;

import java.util.AbstractList;

import com.sun.org.apache.xerces.internal.xs.XSException;
import com.sun.org.apache.xerces.internal.xs.datatypes.ByteList;

/**
 * Implementation of <code>com.sun.org.apache.xerces.internal.xs.datatypes.ByteList</code>.
 *
 * @author Ankit Pasricha, IBM
 * @version $Id: ByteListImpl.java,v 1.7 2010-11-01 04:39:46 joehw Exp $
 * @xerces.internal
 */
public class ByteListImpl extends AbstractList implements ByteList {

  // actually data stored in a byte array
  protected final byte[] data;

  // canonical representation of the data
  protected String canonical;

  public ByteListImpl(byte[] data) {
    this.data = data;
  }

  /**
   * The number of <code>byte</code>s in the list. The range of
   * valid child object indices is 0 to <code>length-1</code> inclusive.
   */
  public int getLength() {
    return data.length;
  }

  /**
   * Checks if the <code>byte</code> <code>item</code> is a
   * member of this list.
   *
   * @param item <code>byte</code> whose presence in this list is to be tested.
   * @return True if this list contains the <code>byte</code> <code>item</code>.
   */
  public boolean contains(byte item) {
    for (int i = 0; i < data.length; ++i) {
      if (data[i] == item) {
        return true;
      }
    }
    return false;
  }

  /**
   * Returns the <code>index</code>th item in the collection. The index
   * starts at 0.
   *
   * @param index index into the collection.
   * @return The <code>byte</code> at the <code>index</code>th position in the
   * <code>ByteList</code>.
   * @throws XSException INDEX_SIZE_ERR: if <code>index</code> is greater than or equal to the
   * number of objects in the list.
   */
  public byte item(int index)
      throws XSException {

    if (index < 0 || index > data.length - 1) {
      throw new XSException(XSException.INDEX_SIZE_ERR, null);
    }
    return data[index];
  }

    /*
     * List methods
     */

  public Object get(int index) {
    if (index >= 0 && index < data.length) {
      return new Byte(data[index]);
    }
    throw new IndexOutOfBoundsException("Index: " + index);
  }

  public int size() {
    return getLength();
  }
}
